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Finding the Fourth Proportional to 86,906.30, 130,129.05 and 68,474.30

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Solution

The fourth proportional to 86,906.30, 130,129.05 and 68,474.30 is: 102,529.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,906.30 : 130,129.05 = 68,474.30 : x
  2. Step 2: Convert to fraction form
    86,906.30/130,129.05 = 68,474.30/x
  3. Step 3: Cross multiply
    86,906.30x = 130,129.05 × 68,474.30
  4. Step 4: Simplify right side
    86,906.30x = 8,910,495,608.42
  5. Step 5: Solve for x
    x = 8,910,495,608.42/86,906.30
  6. Step 6: Final answer
    x = 102,529.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.